132 D. J. SCOURFIELD ON THE ENTOMOSTRACA OF NORTH WALES. 



OSTRACODA.* 



Cypria ophthalmica, Jurine. Only seen from Arthog Marsh 

 (G. S. B.), Bala Lake, and Llyn Padarn. 



Cypria serena, Koch. Apparently the commonest of the 

 Ostracoda of North Wales. For all that, however, it is not 

 particularly abundant, as it has only been seen in seven localities. 

 Some of the specimens were exceptionally dark-coloured. 



Cypris obliqua, G. S. Brady. Llyn Cwm-fTynnon and Bar- 

 mouth Junction Marsh are the only places where this has been 

 obtained. 



Cypiis prasina, Fischer. As a species having a decided pre- 

 ference for water with a trace of salt in it, this finds a congenial 

 home in the Marsh near Barmouth Junction, and there it occurred 

 plentifully in May last. It has not, however, been noted in any of 

 the other brackish water collections. 



Herpetocypris reptans, Baird. Recorded only from Conway 

 Marsh (G. S. B.). 



Cypridopsis vidua, 0. F. Muller. This was found in the 

 marsh below Llyn Padarn and also in the portion of the same lake 

 which is cut off by the railway embankment. 



Cypridopsis aculeata, Lilljeborg. A brackish water species, 

 and found consequently in such places as Arthog Marsh (G. S. B.), 

 pools near high-water, Llanfairfechan (G. S. B.), and Barmouth 

 Junction Marsh. 



Notodiomas monacha, 0. F. Muller. This was pretty abundant 

 in the marsh and ditches near Barmouth Junction last May, and it 

 also occurs in a gathering made by my friend, Mr. Soar, in July, 

 from Llyn y Gader, Cader Idris. 



Limnicythere inopinata, Baird. Pools above high-water, 

 Llanfairfechan (G. S. B.). 



Cytheridea torosa, Jones. Brackish pond, Pwllheli (G. S. B.). 



In addition to the above a single, probably immature, specimen 

 of a Candona was taken among alga, etc., near Llangollen, but 

 the species is uncertain. 



* The nomenclature of this Order is in accordance with Brady and 

 Nor nan's " Monograph of the Ostracoda of the N. Atlantic and N.W. 

 Europe.'' 



